Promiscuous esterase activities of the C-C hydrolases from Dyella ginsengisoli.

A C-C hydrolase gene (bphD(LA-4)) from strain Dyella ginsengisoli LA-4 was cloned and expressed in Escherichia coli BL21 (DE3). BphD(LA-4) together with another hydrolase MfphA(LA-4), which derived from the same strain, possessed esterase activities. p-Nitrophenyl butyrate was the best substrate for both enzymes. BphD(LA-4) had high catalytic efficiency to p-nitrophenyl benzoate, whereas MfphA(LA-4) had no activity. Homology modeling and docking studies demonstrated that the proper hydrogen bond interaction was important for the reactivity of specific substrate.